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"""Color vector library containing HSV and RGB."""
from __future__ import division
import colorsys
import math
class Vector(object):
"""N-dimensional vector class."""
def __init__(self, *components):
"""Create a vector from its components."""
self.components = components
def __add__(self, other):
"""Add two vectors."""
return self.__class__(
*map(lambda (x, y): x + y, zip(self.components, other.components))
)
def __sub__(self, other):
"""Subtract two vectors."""
return self.__class__(
*map(lambda (x, y): x - y, zip(self.components, other.components))
)
def __mul__(self, other):
"""Multiply a vector by a constant."""
return self.__class__(*map(lambda x: x * other, self.components))
def __rmul__(self, other):
"""Multiply a constant by a vector."""
return self * other
def __abs__(self):
"""Return the 2-norm of the vector."""
return math.sqrt(sum(map(lambda x: x * x, self.components)))
def __truediv__(self, scalar):
"""Return self * 1 / scalar."""
return self * (1 / scalar)
class HSV(Vector):
"""HSV 3-vector."""
def __init__(self, hue, saturation, value):
"""Initialize with hue, saturation, and value."""
super(HSV, self).__init__(hue, saturation, value)
def to_RGB(self):
"""Convert to an RGB vector."""
return RGB(*colorsys.hsv_to_rgb(*self.components))
def h(self):
"""Return hue."""
return self.components[0]
def s(self):
"""Return saturation."""
return self.components[1]
def v(self):
"""Return value."""
return self.components[2]
class RGB(Vector):
"""RGB 3-vector."""
def __init__(self, r, g, b):
"""Initialize with red green and blue."""
super(RGB, self).__init__(r, g, b)
def to_HSV(self):
"""Convert to HSV vector."""
return HSV(*colorsys.rgb_to_hsv(*self.components))
def r(self):
"""Return red value."""
return self.components[0]
def g(self):
"""Return green value."""
return self.components[1]
def b(self):
"""Return blue value."""
return self.components[2]
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